专家们认为香烟中的有毒化学物质灰损害毛囊中的基因，同时产生破坏细胞的自由基。

Experts think the toxic chemicals in smoke can damage the DNA in hair follicles and generate cell-damaging free radicals as well.

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结论：本研究结果显示，脊灰病毒引起的细胞病变由感染后产生的子代病毒的继发感染引起。

Conclusion: Our results suggested that secondary infection of the cells was critical to the development of PV-induced cytopathic effect.

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目的评价河北省疾病预防控制中心脊髓灰质炎（脊灰）实验室所用细胞系对脊灰病毒的敏感性，制备河北省脊灰实验室质量控制的标准毒株（QC）。

Objective To evaluate the sensitivity of cell lines to poliovirus used in Hebei Provincial Polio Laboratory (HBPPL) and to prepare standard strain under the Quality Control (QC) of HBPPL.

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